public class Example4_9{
  public static void main(String args[]){
	SIM simOne = new SIM(13889776509L);
	MobileTelephone mobile= new MobileTelephone();
	mobile.setSIM(simOne);
	System.out.println("手机号码："+mobile.lookNumber());
	SIM simTwo = new SIM(15967563567L);
	mobile.setSIM(simTwo);
	System.out.println("手机号码："+mobile.lookNumber());
	}
}

